Engine shuts off while driving when warm

Tiny
ROGER24
  • MEMBER
  • 2002 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Runs fine when cool outside, gets around 85 degrees out and going down the highway just quits running. Let sit for ten minutes starts back up twenty miles later shuts off again.
Sunday, October 7th, 2018 AT 12:12 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,104 POSTS
Hi and thanks for using 2CarPros.com.

Based on your description, it sounds like you may have a faulty crankshaft position sensor. As they heat up, the coils internally expand and lose connection. Thus, the engine stalls due to no spark from the ignition. Take a look through this link.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Here is a link that shows in general how one is replaced:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

When the engine stalls, if it takes time for it to restart, this is my first suspect. In the event that this happens again to you, if possible, I would you to test if the engine is getting spark. Here is a link that shows how it is done:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

If you find there is no spark, I suspect the sensor is the issue. To replace the sensor, you will need to remove the starter, which is not hard. There are only two bolts holding it in place. Make sure to disconnect the negative battery terminal before doing any of the work.

Here are the directions specific to your vehicle for removing and replacing the crankshaft position sensor. All attached pictures correlate with these directions.

_______________________________________

REMOVAL PROCEDURE

IMPORTANT: Perform the CKP System Variation Learn Procedure when the crankshaft position sensor is removed or replaced.

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
3. Remove the starter.
4. Disconnect the crankshaft position (CKP) sensor electrical connector.
5. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine.
6. Remove the CKP sensor retaining bolt.
7. Remove the CKP sensor.

INSTALLATION PROCEDURE
1. Install the CKP sensor.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the CKP sensor retaining fastener.

Tighten
Tighten the bolt to 25 N.m (18 lb ft).
3. Connect the CKP sensor electrical connector.
4. Install the starter.
5. Lower the vehicle.
6. Connect the negative battery cable.
7. Perform the CKP system variation learn procedure. See: Vehicle > Programming and Relearning
___________________________________________

Here is the relearning process, which you may want to consider having done for you. It requires the proper scanner.

CKP SYSTEM VARIATION LEARN PROCEDURE
IMPORTANT: For additional diagnostic information, refer to DTC P1336.

1. Install a scan tool.
2. With a scan tool, monitor the powertrain control module (PCM) for DTCs. If other DTCs are set, except DTC P1336, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set.
3. With a scan tool, select the crankshaft position (CKP) variation learn procedure.
4. Observe the fuel cut-off for the engine that you are performing the learn procedure on.
5. The scan tool instructs you to perform the following:
Block the drive wheels.
Apply the vehicles parking brake.
Cycle the ignition from OFF to ON.
Apply and hold the brake pedal.
Start and idle the engine.
Turn OFF the AC.
Place the vehicle's transmission in Park (A/T) or Neutral (M/T).
The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
- CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set.
- Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set.
- Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
6. With the scan tool, enable the CKP system variation learn procedure.

IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.

7. Slowly increase the engine speed to the RPM that you observed.
8. Immediately release the throttle when fuel cut-off is reached.
9. The scan tool displays Learn Status: Learned this ignition. If the scan tool does NOT display this message and no additional DTCs set, refer to Symptoms - Engine Mechanical. If a DTC set, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set.
10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.

_________________________________________

I hope you find this helpful. Let me know if you have other questions or need additional help.

Take care,
Joe
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Sunday, October 7th, 2018 AT 6:29 PM

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